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headset keeps coming loose

martinhayesmartinhayes Posts: 28
edited August 2010 in Workshop
I've tightened my headset a few times now and after a 40/50 mile ride, I can feel play in the headset.

I've tightened it but it doesnt seem to work, any ideas?

Posts

  • keef66keef66 Posts: 13,123
    Can you describe exactly what you're doing? Do you have an alloy or carbon steerer?

    If the headset is coming loose it means that the stem is able to move up the steerer, suggesting the clamp bolts aren't tight enough. This will also pull the top cap upwards, probably moving the star nut or expander inside the steerer.

    Procedure should be:

    loosen the 2 stem clamp bolts

    gently tighten the top cap bolt until there's no play or binding in the headset. This bolt needs a low torque; it's sole purpose in life is to load the bearings properly.

    Ensuring the steerer is pointing in the right direction, progressively tighten the stem clamp bolts. Use a torque wrench if you have a carbon steerer.


    If you cannot remove the play, take off the top cap and check that the top of the steerer tube sits at least 3 mm below the top of the stem or the upper spacer.
  • nicklousenicklouse Posts: 50,675 Lives Here
    keef66 wrote:
    Can you describe exactly what you're doing? Do you have an alloy or carbon steerer?

    If the headset is coming loose it means that the stem is able to move up the steerer, suggesting the clamp bolts aren't tight enough. This will also pull the top cap upwards, probably moving the star nut or expander inside the steerer.

    Procedure should be:

    loosen the 2 stem clamp bolts

    gently tighten the top cap bolt until there's no play or binding in the headset. This bolt needs a low torque; it's sole purpose in life is to load the bearings properly.

    Ensuring the steerer is pointing in the right direction, progressively tighten the stem clamp bolts. Use a torque wrench if you have a carbon steerer.


    If you cannot remove the play, take off the top cap and check that the top of the steerer tube sits at least 3 mm below the top of the stem or the upper spacer.

    and that the top cap does not bottom out on the plug/star nut.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • rakerake Posts: 3,204
    how old is the bike? do you rain ride? either carbon assembly paste if its carbon steerer or may need the head refacing if its integrated.
  • ride_wheneverride_whenever Posts: 13,279
    and that said plug/star nut is straight... I've had that cause issues in the past.
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